Features: brand new and high quality CO2 Drop Checker: Our CO2 monitor for aquarium can efficiently monitoring of CO2 levels in your for tank. The CO2 fish for tank checker includes the highest quality glass drop checker. Easy To Use: The user-friendly CO2 detector is very convenient and gives you reliable reading in about 2 hours without syringes or other such items. Just fill the carbon dioxide monitor drop checker with the indicator solution and place it in the planted for tank. (No reagent solution included.) Essential Item: You need to be very careful about the for health of your plants and carbon dioxide is one of their major requirements. This CO2 monitor is one of the most vital items of your aquarium kit that helps you to keep a constant check on CO2 levels in the water. Multi Options: We offer 4 types of glass CO2 checker to choose. 2 of which need use with sucktion cup (included). Quality Material: Made of high-quality glass. Specially for pressurized CO2 system plant for tank. Specifications: Material: Glass Color: Transparent Style: Note Shape/Ball Shape/N Shape/Thumb Shape Size: As Pictures Show Weight: Approx.20g Package Includes: 1 x CO2 Drop Checker (Note Shape/Ball Shape/N Shape/Thumb Shape) 1 x Suction Cup (Only for Note Shape and Ball Shape) note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!